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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    Patrick Walton‏ @pcwalton Oct 19

    An important goal of programming language design should be to make it as hard as possible to come up with stupid tricky interview questions.

    8:24 AM - 19 Oct 2018
    • 292 Retweets
    • 1,305 Likes
    • Manikanta Somayaji Яр ralph thomas Lindsey Kuper joho🌹🌹🌹🌹🌹 Vincent Murphy craignicol Yazeed Al Oyoun Chris Elgee
    16 replies 292 retweets 1,305 likes
      1. New conversation
      2. Felix S K II‏ @pnkfelix Oct 19
        Replying to @pcwalton

        I’m pretty sure Rust fails that test badly

        2 replies 0 retweets 6 likes
      3. Patrick Walton‏ @pcwalton Oct 19
        Replying to @pnkfelix

        Does it? I guess so, but not as badly as most other popular languages.

        1 reply 0 retweets 2 likes
      4. stymaar  ⭐ ⭐‏ @stymaar Oct 19
        Replying to @pcwalton @pnkfelix

        Well, it's indeed better than C++ or even C. But I'm not even sure it's better than JavaScript in that regards.

        1 reply 0 retweets 3 likes
      5. stymaar  ⭐ ⭐‏ @stymaar Oct 19
        Replying to @stymaar @pcwalton @pnkfelix

        The good thing is: in Rust the answer to most of the tricky questions for those other languages would be “it fails to compile” instead of “it does some insanely stupid shit that will haunt you for days in production”.

        1 reply 0 retweets 26 likes
      6. unsafe { &**rreverser }‏ @RReverser Oct 20
        Replying to @stymaar @pcwalton @pnkfelix

        If it fails to compile, it's not a tricky question :)

        1 reply 0 retweets 3 likes
      7. Felix S K II‏ @pnkfelix Oct 20
        Replying to @RReverser @stymaar @pcwalton

        <show code>. Q1. “What is misleading about rustc’s diagnostic here?” Q2. “Fix the code to compile (and work)”

        1 reply 0 retweets 3 likes
      8. Felix S K II‏ @pnkfelix Oct 20
        Replying to @pnkfelix @RReverser and

        I haven’t shown the code yet but I could come up with some tricky examples. They wouldn’t be usable forever, assuming compiler diagnostics and language expressiveness improves over time. But still seems like it would fall into bucket pcwalton defined.

        1 reply 0 retweets 0 likes
      9. Felix S K II‏ @pnkfelix Oct 20
        Replying to @pnkfelix @RReverser and

        Still, I admit that as an interviewer, i would need to *work* to do this. And thus @pcwalton’s desire may be met in this instance.

        1 reply 0 retweets 0 likes
      10. 3 more replies
      1. New conversation
      2. The Intrepid Brontomerus‏ @johnazariah Oct 19
        Replying to @pcwalton

        I remember being asked why I answered a "Find a loop in this linked list" in C and not #fsharp, and I responded that you only have the problem in a language where you conflate the structure of something with its semantic - so I could only answer it in such a language!

        1 reply 1 retweet 21 likes
      3. The Intrepid Brontomerus‏ @johnazariah Oct 19
        Replying to @johnazariah @pcwalton

        Heck, I think I would fail if I were asked to create a circular linked list in #fsharp or #haskell or #scheme! I don't think you can without some major conniptions!

        4 replies 0 retweets 2 likes
      4. Jack Fox‏ @foxyjackfox Oct 19
        Replying to @johnazariah @pcwalton

        Pretty sure there is a circular buffer in FSharpx.Collections. IIRC it is not purely functional.

        1 reply 0 retweets 1 like
      5. The Intrepid Brontomerus‏ @johnazariah Oct 19
        Replying to @foxyjackfox @pcwalton

        yes, and it would lead to a trivial solution for "is this a circular buffer?" :D

        0 replies 0 retweets 5 likes
      6. End of conversation
      1. New conversation
      2. Sameer Ajmani‏ @Sajma Oct 19
        Replying to @pcwalton

        Perhaps a better goal: design a company that doesn't ask those kinds of interview questions.

        1 reply 0 retweets 40 likes
      3. 1 more reply
      1. Bob Nystrom‏ @munificentbob Oct 19
        Replying to @pcwalton

        When @joshbloch was on the #dartlang team, he used to say his job was to make it impossible for himself to later write a "Dart Puzzlers" book.

        0 replies 0 retweets 37 likes
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      1. Greg Parker‏ @gparker Oct 19
        Replying to @pcwalton

        Classify each of the following as a valid Swift identifier, valid Swift operator, or neither: 1. x 2. % 3. 🅐 4. ⚽️ 5. 🤑 6. 🇮🇴

        0 replies 1 retweet 15 likes
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      1. New conversation
      2. James Tauber‏ @jtauber Oct 19
        Replying to @pcwalton @SamanthaZeitlin

        in my own experience, Python does a wonderful job of thwarting interview questions devised by Java programmers

        1 reply 0 retweets 5 likes
      3. Samantha Zeitlin‏ @SamanthaZeitlin Oct 20
        Replying to @jtauber @pcwalton

        I have opinions on this, but they won’t fit in a tweet.

        0 replies 0 retweets 5 likes
      4. End of conversation
      1. hey, are you stalking me?  🎮‏ @vovchisko Oct 21
        Replying to @pcwalton

        Okay, Javascript: function ಠ_ಠ ( ) { /* is it valid function name? */ }

        0 replies 2 retweets 3 likes
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      1. Jérémy Lal‏ @kapouer Oct 19
        Replying to @pcwalton

        According to Gödel, you can make stupid tricky questions about everywhere...

        0 replies 0 retweets 4 likes
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